Write a program to copy a file to a destination file using message queues.?

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  1. #1
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    Lightbulb Write a program to copy a file to a destination file using message queues.?

    Write a program to copy a file to a destination file using message queues.
    The server (writer process) has to split the data in the file appropriately
    and send it to the message queue. There should be one writer process which
    writes into the message queue and four reader processes which read the
    appropriate message from message queue and writes into the destination file.
    Use semaphores to synchronize writing into the file by the reader process.

    How to handle this problem?
    If we use 4 reader process and write into one destination file.... with the same copy of source file?
    Last edited by krishnampkkm; 03-03-2010 at 02:02 AM.

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    Registered User ungalnanban's Avatar
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    Thumbs up

    Here is the algorithm ,

    1 . Create a message queue id by using the "msgget".

    2 . Then open the source file and copy a line to the message queue buffer then send that to the queue.

    3 . Among the four process any one has to lock the file by using the semophore functions.

    4. And then the process has the read the queue.And it has to write the current contents of the message queue.

    5.After some times it has to release the lock and increment the semaphore value to 1.
    6. Using the loop just read every line and the same operations.

    First Understand the functions :

    msgget
    msgsnd
    msgctl
    msgrcv
    semget
    semop

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    Exclamation :):):)



    Tanku

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